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173篇 您的检索式:作者名="Zhenhua Zhao"
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1Adakite-type sodium-rich rocks in Awulale Mountain of west Tianshan:Significance for the vertical growth of continental crust显示文摘The sodium-rich dacites and albite porphyries of Permian in the Awulale Mountain of west Tianshan have unique chemical and trace element signatures identical to adakite. These intermediate-acidic igneous rocks are characterized by high Na2O, Al2O3 and Sr contents and high Sr/Y and La/Y ratios (>40 and >20, respectively), and low Y and Yb contents, and strong depletion in HREE, and positive Eu anomaly. The (143Nd/144Nd)i is in the range from0.51236 to 0.51248 and the εNd(t) is positive value (+0.79-+3.11); the (87Sr/86Sr)i is in the range from 0.7052 to 0.7054. These Nd and Sr isotopic composition features indicate that the source rocks of these adakite-type rocks are from a weakly depleted mantle, or a depleted mantle, but was contaminated by the crustal materials. These adakite-type rocks were most likely derived from the partial melting of new underplated basaltic rocks under the conditions of amphibo-lite to eclogite transition in the postcollisional environment of North Xinjiang during the PermianXIONG Xiaolin ZHAO Zhenhua BAI Zhenghua MEI Houjun WANG Yixian WANG Qiang XU Jifeng Niu Hecai BAO Zhiwei 2001Chinese Science Bulletin2001,46,10:25
2Geochronology and geochemistry of the Fangcheng Neoproterozoic alkali-syenites in East Qinling orogen and its geodynamic implications显示文摘Finding of Neoproterozoic syenites at Fangcheng in the northern Qinling region of the East Qinling orogen provides an important constraint on timing of tectonic transformation to extensional regime. The alkaline pluton consists mainly of nepheline syenite,aegirine syenite,and alkali-feldspar syenite. The syenites are of intermediate (SiO2=54%―62%),rich in alkali (K2O+Na2O=12%―15%),aluminum (Al2O3=16.81%―23.26%) and large ion lithophile elements (LILE),without any obvious Nb,Ta,Zr,and Hf anoma-lies. The Fangcheng syenites are geochemically characterized by relative enrichment of LREE,minor differentiation of HREE,significant negative Eu anomalies (Eu=0.13―0.23),less negative εNd(t) values of -1.37 to -3.90,young Nd model ages of 1364 to 1569 Ma,and high zircon saturation temperatures of 915 to 1044℃. The syenitic magmas probably originated from small proportion melting of upper mantle in an extensional regime of intraplate-anorogenic tectonic setting,and have been slightly contaminated by crustal materials during ascending and/or emplacement. LA-ICP-MS zircon U-Pb dating yields ages of 844.3±1.6 Ma (MSWD=0.86),suggesting that the Fangcheng alkaline syenites formed in the early Neo-proterozoic. They are the oldest Neoproterozoic alkaline rocks ever recognized in the Qinling orogen as well as in South China. This implies that the tectonic regime of the Qinling region would have transformed from post-collisional stretch to intraplate-anorogenic extension no later than 844 Ma.BAO ZhiWei WANG Qiang BAI GuoDian ZHAO ZhenHua SONG YaoWu LIU XiaoMing 2008Chinese Science Bulletin2008,53,13:22
3A peculiar composite M-and W-type REE tetrad effect:Evidence from the Shuiquangou alkaline syenite complex,Hebei Province,China显示文摘A new type of REE tetrad effect,a composite M-and W-type,was recognized in the K-feldsparthized and silicificated Shuiquangou alkaline syenites,Dongping,Hebei Province.Different analytical methods such as ICP-MS and isotopic dilution thermal ion mass spectrometer were exploited to verify the REE concentrations of the samples in three laboratories in China,France and Korea.The results are reliable and consistent within errors.In situ quantitative analysis of REE concentrations of individual zircons and apatites extracted from the very same sample has shown that fractional crystallization of magma and the superimposed hydrothermal alteration might have taken place in at least two-stage hydrothermal activities to generate the composite M-and W-type REE tetrad effect.The coexisting melt and aqueous phases,the superimposed alteration by volatile(Cl,CO2) -and Si,K, Al-enriched high temperature hydrothermal fluids might be the important facts for this new MW-type of REE tetrad effect.In addition,the peculiar MW-type tetrad effect might be an indicator for Au mineralization of reworked plutons.ZHAO ZhenHua BAO ZhiWei QIAO YuLou 2010Chinese Science Bulletin2010,55,24:19
4Experimental investigations on the heat transfer characteristics of micro heat pipe array applied to flat plate solar collector显示文摘This paper introduces a novel flat plate solar collector(FPC) using micro heat pipe array(MHPA) as a key element.To analyze the thermal transfer behavior of flat plate solar collector with micro heat pipe array(MHPA-FPC),an indoor experiment for thermal transfer characteristic of MHPA applied to FPC was conducted by using an electrical heating film to simulate the solar radiation.Different cooling water flow rates,cooling water temperatures,slopes,and contact thermal resistances between the condenser of MHPA and the heat exchanger were tested at different heating powers.The experimental results indicate that MHPA-FPC exhibits the enhanced heat transfer capability with increased cooling water flow rate and temperature.Total thermal resistance has a maximum decline of approximately 10% when the flow rate increases from 180 to 360 L h 1 and 38% when the cooling water temperature increases from 20℃ to 40℃.When the inclination angle of MHPA-FPC exceeds 30°,the slope change has a negligible effect on the heat transfer performance of MHPA-FPC.In addition,contact thermal resistance significantly affects the heat transfer capability of MHPA-FPC.The total thermal resistances lowers to nearly half of the original level when contact material between the condenser of MHPA and the heat exchanger changes from conductive silicone to conductive grease.These results could provide useful information for the optimal design and operation of MHPA-FPC.DENG YueChao QUAN ZhenHua ZHAO YaoHua WANG LinCheng 2013Science China(Technological Sciences)2013,56,5:17
5Geochemistry of Alkali-rich Igneous Rocks of Northern Xinjiang and Its Implications for Geodynamics显示文摘Five nearly E-W-trending alkali-rich igneous rock belts are distributed from north to south in northern Xinjiang, and they are composed mainly of riebeckite, K-feldspar granite and high-K and medium-K calc-alkaline volcanic rocks and shoshonite. They were mainly emplaced or erupted between the Carboniferous and Permian. The compositions of Sr, Nd, Pb, and O isotopes imply that their principal resource materials are derived from the upper mantle or juvenile crust, indicating obvious continental growth in the Phanerozoic. The trace element association implies that their tectonic settings are within plate and volcanic arc for alkali-rich granites, and post-collisional arc, late oceanic arc and continental arc for alkali-rich volcanic rocks. An archipelago model was suggested for the tectonic evolution in northern Xinjiang. It can be named the central-Asia-type orogeny, which is different from the so called circum-Pacific ocean-continent-type tectonics or the Alpine-HimalayanZHAO Zhenhua BAI Zhenghua XIONG Xiaolin MEI Houjun WANG Yixian 2000Acta Geologica Sinica(English Edition)2000,74,2:16
6The recognition of adakite-type gneisses in the North Dabie Mountain and its implication to ultrahigh pressure metamorphic geology显示文摘Adakite is an igneous rock generated by the partial melting of subducting ocean slab in an island arc setting. Meanwhile, residuals of the slab-melting are transformed to eclogite or garnet-amphibolite during a slab subduction process. This note reports the adakite-type grey gneisses discovered in the North Dabie Mountain. These adakitic rocks are characterized by high AI2O3(14.97%-17.56%), Sr (545-941 μg/g), Sr/Y (44.71-218.98), La/Yb (16.70-97.50), and low Y (3.32-12.19μg/g), Yb (0.31-1.34 μg/g), Sc (0.92-4.2μg/g), as well as positive Sr anomaly but absent or positive Eu anomaly. They are different from the low aluminum grey gneisses with low AI2O3 (13.73%-14.38%), Sr (262-409 μg/g), Sr/Y (6.46-15.97) and La/Yb (1.90-22.60), high Y(21.79-36.24 μg/g), Yb (2.00-5.59 μg/g) , Sc (8.30%-12.70%), and negative Sr, Eu anomaly in the North Dabie Mountain. The adakite-type grey gneisses in the North Dabie Mountain were most probably formed by the partial melting of subducting ocean slab before theWANG Qiang XU Jifeng WANG Jianxin ZHAO Zhenhua WANG Renjing QIU Jiaxiang XIONG Xiaolin SANG Longkang PENG Lianhong 2000Chinese Science Bulletin2000,45,21:12
7Accumulation and potential sources of heavy metals in soils of the Hetao area,Inner Mongolia,China显示文摘Soil contamination by heavy metals is a problem in agricultural irrigation systems.To assess the accumulation and sources of heavy metals in the Yongji irrigation district of the Hetao area,Inner Mongolia,China,195 soil samples from 39 sites(0–100 cm)were collected,and Zn,Cu,Pb,Cr,and Cd concentrations were analyzed.The mean concentrations were 107.17,32.48,12.31,53.53,and 0.22 mg kg-1,respectively,with no significant differences between soil depths(P>0.05).Concentrations of Zn,Cu,and Cd were higher than the background levels,with moderate accumulation;the contamination factor(CF)values were 1.9,1.7,and 1.9,respectively,and the geoaccumulation index(Igeo)was>0.Concentrations of Pb and Cr were lower than,or close to,the background levels(CF<1,Igeo<0),indicating that they originated from a natural source.The monomial potential ecological risk index(Eri)for Zn,Cu,Pb,and Cr was low;Eri for Cd was 55.73,implying a moderate risk.The grade of potential ecological risk index of the five heavy metals(RI)was low,declining from south to north.The studied soils were contaminated with Zn,Cu,and Cd;principal component(PC)analysis implicated the enrichment of Cd and partial Cu(high loading in PC 2)was related to agricultural activities;Zn and partial Cu,closely associated with PC 3,may have originated from irrigation water from the Yellow River.Future agricultural development should focus on fertilizer and pesticide application and the quality of irrigation water.Yangchun ZHU Lijin WANG Xueyong ZHAO Jie LIAN Zhenhua ZHANG 2020Pedosphere2020,30,2:12
8Polarization-maintaining few mode fiber composed of a central circular-hole and an elliptical-ring core显示文摘We propose a novel waveguide design of polarization-maintaining few mode fiber(PM-FMF) supporting ≥10non-degenerate modes, utilizing a central circular air hole and a circumjacent elliptical-ring core. The structure endows a new degree of freedom to adjust the birefringence of all the guided modes, including the fundamental polarization mode. Numerical simulations demonstrate that, by optimizing the air hole and elliptical-ring core,a PM-FMF supporting 10 distinctive polarization modes has been achieved, and the effective index difference Δn_(eff) between the adjacent guided modes could be kept larger than 1.32 × 10^(-4) over the whole C +L band. The proposed fiber structure can flexibly tailored to support an even larger number of modes in PM-FMF(14-mode PM-FMF has been demonstrated as an example), which can be readily applicable to a scalable mode division multiplexing system.JIAJIA ZHAO MING TANG KYUNGHWAN OH ZHENHUA FENG CAN ZHAO RUOLIN LIAO SONGNIAN FU PERRY PING SHUM DEMING LIU 2017Photonics Research2017,5,3:9
9Defects as a factor limiting carrier mobility in WSe2: A spectroscopic investigation显示文摘二维的转变金属 dichalcogenides (TMD ) 的电的表演被结构的缺点的数字强烈影响。在这个工作,我们提供一条光分光镜的描述途径相关结构的缺点的数字和 WSe 2 设备的电的表演。electron-beam-lithographyprocessed WSe 2 的低温度的光致发光(PL ) 系列由于缺点一定的激子展出清楚的导致缺点的 PL 排出物,它将强烈降级电的表演。由采用一种 electron-beam-free 转移电极技术,我们成功地准备了包含缺点的有限数量的一台 backgated WSe 2 设备。约 200 厘米 2Zhangting Wu Zhongzhong Luo Yuting Shen Weiwei Zhao Wenhui Wang Haiyan Nan Xitao Guo Litao Sun Xinran Wang Yumeng You Zhenhua Ni 2016Nano Research2016,9,12:8
10Influence of pre-tension on ballistic impact performance of multi-layer Kevlar 49 woven fabrics for gas turbine engine containment systems显示文摘In this paper, ballistic impact tests on wrapped multi-layer Kevlar 49 woven fabric systems were carried out with a flat blade projectile to investigate the impact response during a fan blade out event. The influences of the number of Kevlar layers and pre-tension were discussed particularly. Test results were used to analyze failure modes and energy absorption characteristics of multi-ply Kevlar fabrics. Results show that there are two kinds of impact damage for fabrics: global deformation mainly involving stretching of yarns in the impact region and fabric wrinkle from both sides to the impact zone, and local damage characterized by yarn fracture, yarn pull-out, and yarn unraveling. The energy absorption capability of Kevlar 49 woven fabrics improves with the number of fabric layers. The energy absorbed by multi-layer fabrics increases slightly at the beginning and then decreases substantially with pre-tension. The work in this paper can provide guidance for designing light-weight multi-layer fabrics containment systems.Lulu LIU Zhenhua ZHAO Wei CHEN Gang LUO 2018Chinese Journal of Aeronautics2018,31,6:7
11A Comparison Study of Working Memory Deficits between Patients with Methamphetamine-Associated Psychosis and Patients with Schizophrenia显示文摘Hong GAN Zhenhua SONG Peiwei XU Hang SU Yingying PAN Min ZHAO Dengtang LIU 2018上海精神医学2018,30,3:6
12Discovery of Permian island-arc basalts in the Cenxi area and the tectonic significance──A piece of evidence for the paleo-Tethyan tectonic belt in western Guangdong and eastern Guangxi显示文摘Cenxi Permian basalts are the late Palaeozoic island-arc type basalts first found in South China. REE and trace element characteristics and distribution patterns show that this volcanic formation, which has been isotopically dated at 261 MaB.P. by the 39Ar/ 40Ar method, is of an active continental marginal island arc type, and that the tectonic environment at that time was an island-arc marginal sea or minor ocean basin related with the paleo-Tethyan tectonic belt in western Guangdong-eastern Guangxi.ZHANG Boyou 1, ZHAO Zhenhua 1, SHI Manquan 1, YANG Shufeng 2 and CHEN Hanlin 2 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 2. Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China 1998Chinese Science Bulletin1998,43,21:6
13Pathological changes in the lungs and lymphatic organs of 12 COVID-19 autopsy cases显示文摘Systematic autopsy and comprehensive pathological analyses of COVID-19 decedents should provide insights into the disease characteristics and facilitate the development of novel therapeutics.In this study,we report the autopsy findings from the lungs and lymphatic organs of 12 COVID-19 decedents—findings that evaluated histopathological changes;immune cell signature and inflammatory factor expression in the lungs,spleen and lymph nodes.Here we show that the major pulmonary alterations included diffuse alveolar damage,interstitial fibrosis and exudative inflammation featured with extensive serous and fibrin exudates,macrophage infiltration and abundant production of inflammatory factors(IL-6,IP-10,TNFo?and IL-I f).The spleen and hilar lymph nodes contained lesions with tissue structure disruption and immune cell dysregulation,including lymphopenia and macrophage accumulation.These findings provide pathological evidence that links injuries of the lungs and lymphatic organs with the fatal systematic respiratory and immune malfunction in critically ill COVID-19 patients.Qian Liu Yu Shi Jun Cai Yaqi Duan Rongshuai Wang Hongyan Zhang Qiurong Ruan Jiansha Li Lei Zhao Yifang Ping Rong Chen Liang Ren Xiaochun Fei Heng Zhang Rui Tang Xi Wang Tao Luo Xindong Liu Xuequan Huang Zhenhua Liu Qilin Ao Yong Ren Jing Xiong Zhicheng He Haibo Wu Wenjuan Fu Pengnan Zhao Xinwei Chen Guoqiang Qu Yunyun Wang Xi Wang Jia Liu Dongfang Xiang Sanpeng Xu Xiaowei Zhou Qingrui Li Jinghong Ma Heng Li Jie Zhang Sizhe Huang Xiaohong Yao Yiwu Zhou Chaofu Wang Dingyu Zhang Guoping Wang Liang Liu Xiu-Wu Bian 2020National Science Review2020,7,12:6
14Early postoperative infarction out of the middle cerebral artery distribution following superficial temporal artery-middle cerebral artery bypass: clinical features and pathogenesis显示文摘The extracranial-intracranial (EC-IC) bypass surgery has been widely used in the treatment of cerebral ischemia,intracranial aneurysms,and other diseases for more than 40 years.In terms of treating atherosclerotic cerebral ischemia,the surgery is presumed to be helpful for the subgroup of hemodynamic compromise in prevention of subsequent stroke.However,two multicenter trials presented with high perioperative stroke rate and failed to demonstrate the profit of the surgery.1-3 On this point,one of the crucial issues currently is how to lower down the perioperative stroke rate,the centerpiece of which is early postoperative infarction (EPI).Zhang Dong Huang Zhenhua Zhao Jizong 2014Chinese Medical Journal2014,,11:5
15Incidence and clinical characteristics of inflammatory bowel disease in a developed region of G uangdong P rovince, C hina: A prospective population‐based study显示文摘Zhirong Zeng Zhenhua Zhu Yuyu Yang Weishan Ruan Xiabiao Peng Yuhuan Su Lin Peng Jinquan Chen Quan Yin Chao Zhao Haihua Zhou Shuai Yuan Yuantao Hao Jiaming Qian Siew Chien Ng Minhu Chen Pinjin Hu 2013J Gastroenterol Hepatol2013,,7:5
16Promoting proliferation and differentiation of BMSCs by green tea polyphenols functionalized porous calcium phosphate显示文摘In this article,we proposed a facile protocol to functionalize porous calcium phosphate ceramics(PCPC)using dietary tea polyphenols(TP).TP molecules was attracted and anchored by Ca2t ions from the surface of CPC.These TP molecules modulated the nucleation and crystallization of calcium phosphate nanorods assemblies on the surface of PCPC.Our results prove that these calcium phosphate nanorods assemblies accompanies functional groups of TP make PCPC/TP effectively promote proliferation and differentiation of bone mesenchymal stem cells(BMSCs).We inferred that these calcium phosphate nanorods assemblies might change the surface microenvironment of PCPC,which is critical to promote the proliferation and differentiation of BMSCs.Compared with naked PCPC,PCPC/TP obviously increased BMP2,ErK/MAPK and JNK/MAPK level and mineralization capacity of cells(ALP level).Kang Zhou Xiuli Ren Mengen Zhao Xifan Mei Peng Zhang Zhenhua Chen Xiangdong Zhu 2018Regenerative Biomaterials2018,5,1:5
17Physico-mechanical properties of granite after cyclic thermal shock显示文摘Understanding rock mechanical behaviors after thermal shock is critically important for practical engineering application.In this context,physico-mechanical properties of Beishan granite,Gansu Province,China after cyclic thermal shock were studied using digital image correlation(DIC),acoustic emission(AE)monitoring,and microscopic observation.The results show that the peak strength and elastic modulus decreased gradually with increase in thermal shock cycle.However,the above two parameters showed no further changes after 10 thermal shock cycles.The loading stress ratio(i.e.the ratio of the current loading stress level to the peak stress in this state)corresponding to the occurrence of the uneven principal strain field and the local strain concentration zone on the surface of the granite specimen decreased with increase in thermal shock cycle.Three transformation forms of the standard deviation curves of the surface principal strain were found.For granite with fewer thermal shock cycles(e.g.no more than 2 cycles),the standard deviation curves exhibited approximately exponential growth in exponential form.With increase in thermal shock cycle,the S-shaped curve was dominant.After 10 thermal shock cycles,an approximate ladder-shaped curve was observed.It is displayed that AE activity was mainly concentrated around the peak strength zone of the granite specimen when the rock samples underwent fewer thermal shock cycles.With increase in thermal shock cycle,AE activity could occur at low loading stress levels.Microscopic observation further confirmed these scenarios,which showed that more microcracks were induced with increase in thermal shock cycle.The number of induced microcracks at the edge location of the granite specimen was significantly larger than that at the interior location.Finally,a continuum damage model was proposed to describe the damage evolution of the granite specimen after cyclic thermal shock during loading.Peiyang Yu Peng-Zhi Pan Guangliang Feng Zhenhua Wu Shankun Zhao 2020Journal of Rock Mechanics and Geotechnical Engineering2020,12,4:4
18CO2 methanation and co-methanation of CO and CO2 over Mn-promoted Ni/Al2O3 catalysts显示文摘一系列支持 Mn 15 wt-% Ni/Al 2 O 3 催化剂被一个早期的湿受精方法准备。在 Ni/Al 2 为公司 2 methanation 和在一个改正床反应堆的公司和公司 2 的 comethanation 的 O 3 催化剂被调查。催化剂被 N2 physisorption 描绘,氢规划温度的减小和解吸附作用,二氧化碳规划温度的解吸附作用, X 光检查衍射和 highresolution 传播电子显微镜学。Mn 的存在增加了公司 2 吸附地点的数字并且由于改进 Ni 分散禁止了 Ni 粒子凝块并且削弱了在镍种类和支持之间的相互作用。支持 Mn 15 wt-% Ni/Al 2 O 3 催化剂特别在低温度改进了公司 2 methanation 活动(250 ~ 400 25 ?1, 的 mg 12.5 ?2 的 mg 并且 25 ? 导致了 32 的 3 的 mg ? B 1, 的 s 32.89?Zn, Cu, Se, Mn,我, Fe,瞬间和 Br。mea 覈 ? 覈??Kechao Zhao Zhenhua Li Li Bian 2016Frontiers of Chemical Science and Engineering2016,10,2:4
19The Oncoprotein HBXIP Uses Two Pathways to Up-regulate S100A4 in Promotion of Growth and Migration of Breast Cancer Cells显示文摘Shuangping Liu Leilei Li Yingyi Zhang Yiwen Zhang Yu Zhao Xiaona You Zhenhua Lin Xiaodong Zhang Lihong Ye 2012Journal of Biological Chemistry2012,,36:3
20Immobilization of carbonic anhydrase for facilitated CO2 capture and separation显示文摘Carbonic anhydrase(CA)as a typical metalloenzyme in biological system can accelerate the hydration/dehydration of carbon dioxide(CO2,the major components of greenhouse gases),which performer with high selectivity,environmental friendliness and superior efficiency.However,the free form of CA is quite expensive(~RMB 3000/100 mg),unstable,and non-reusable as the free form of CA is not easy for recovery from the reaction environment,which severely limits its large-scale industrial applications.The immobilization may solve these problems at the same time.In this context,many efforts have been devoted to improving the chemical and thermal stabilities of CA through immobilization strategy.Very recently,a wide range of available inorganic,organic and hybrid compounds have been explored as carrier materials for CA immobilization,which could not only improve the tolerance of CA in hazardous environments,but also improve the efficiency and recovery to reduce the cost of large-scale application of CA.Several excellent reviews about immobilization methods and application potential of CA have been published.By contrast,in our review,we stressed on the way to better retain the biocatalytic activity of immobilized CA system based on different carrier materials and to solve the problems facing in practical operations well.The concluding remarks are presented with a perspective on constructing efficient CO2 conversion systems through rational combining CA and advanced carrier materials.Zhenhua Wu Yan Nan Yang Zhao Xueying Wang Shouying Huang Jiafu Shi 2020Chinese Journal of Chemical Engineering2020,28,11:3
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